Die head operating means



Oct. 2351945. D. R. PowELpET Al. 3g-.7,290

Oct. 23, 1945.

D. POWELL ErAL 2,387,290 DIE HEAD OPERATING MEANS Filed Aug. 19 1943 s sheets-sheet 3 Q I4 g1 L5' I8 20 r w HUT'ORQZ f Patented Oct. 23, 1945` UNITED STATES PATENT o-FFICE DIE HEAD OPERATING MEANS David R. Powell and William'L. Moore, Cleveland,

Ohio, assignors to The National Acme Company, Cleveland, Ohio, a corporation of Ohio Application August 19, 1943, Serial No. 499,172 (ci. 1li- 95) The present invention relates to threading tools such as taps and dies and more particularly to die head operating means, the principal object being the provision of improved means for opening, closing and resetting the chasers of a die and which is simple in construction, eifcient and positive in operation and inexpensive to manufacture.

A further object of the invention is the provision of simplified means for opening the die to permit removal of the chasers without the necessity of dismantling the die and which is controlled by the same means that opens and resets the chasers.

A still further object of the invention is the provision of means for completely dismantling the die, likewise under the control of the same opening and closing means.

Heretofore, many different means have been employed for these various objects, such as fulcrumed levers, latches, etc., all of which have been more or less unsatisfactory and the present invention eliminates many defects while, at the same time, it combines vinto a single operating means the various desirable features hereinbefore set forth. Further advantages will be apparent from the following detailed description.

In the drawings accompanying and forming a part of this specification:

Fig. 1 is a perspective view of the die head unassembled.

Fig. 2 is an end View illustrating the chasers in place.

Fig. 3 is a perspective view of the operating member.

Fig. 4 is a partial section illustrating a chaser and block in open position.

Fig. 5 is a plan view of the die head illustrating the operating handle in closed position and in dotted lines the position of the handle when the head is opened.

Fig. 6 is a partly sectional View of Fig. 5.

Fig. 'l is-an end view of Fig. 6 without the chasers. Y

Fig. 8 is a vertical section taken on the line 8-8 of Fig. 6.

Fig. 9 is a partly sectional view of the die head, illustrating the operating handle and die cut in position for removing the chasers. Y

Fig. 10 is a sectional view of the die head, illustrating its position when the chasers are open, and

Fig. 11 is a sectional View of the die head, illustrating the position of the operating means when 10 Claims.

dismantled, as illustrated in this improved die head comprises a shank 2 for attachment to the usual holding means of a machine and this shank is provided at its front end with a body portion 3 having in the end thereof a series of radially located T-slots 4 for the reception of chaser blocks 5 carrying suitable chasers 6.

vIn the present instance, these chasers have been illustrated as circular but it is to be understood any other type of chaser may be employed since the chaser per se forms no part of the present invention. The blocks 5 have the usual pins 5 in engagement with suitable springs 5 for shifting the chasers outwardly, the chasers being closed or collapsed when the body is forced into the die cup or cap I3 hereinafter referred to. This is due to the engagement of the front edge of the collar I3 with the beveled portion on the rear of each chaser .block 5 as shown in Fig. 4.

The b ody portion 3.of. the die head is provided at the rear thereof with a plate l, suitably secured thereto, of substantially the same diameter as the body portion and in front of this plate the body is provided with a circumferential, peripheral slot 8 and in front thereof with a secondcircumferential, peripheral slot 9 somewhat deeper than the -rst slot, the purpose of both of which will be more fully described hereinafter.

Located in 'the rear of the body portion 3 and plate 'I is an adjusting ring I0 having a forwardly extending pin II extending into a bushing I2 located in the die body. The particular construction of this pin and bushing forms a part of a separate application led August 19, 1943, Serial Number 499,174, and will not be described further herein.

Surrounding the body 3 is a die cup or cap f I3 of a construction somewhat similar to that used in many threading patents of The National Acme Company, particular reference being had to the William J. Hogg Patent No. 1,952,205, eX-

cept that, in place of the grooved collar 5 for sition by means of a suitable spring bearingv at one end against the collar I6 and at the other end against the shoulder of a hollow nut 2l` threaded into the opening I9 of the'cup I3.V

fil

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claims or the requirements of the prior art.

Having thus explained the nature of our said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, we claim:

, y 1. A threading die comprising a chaser-car frying body, a closing cap, one shiftable relative Normally, when the die is assembled, the pin I1 is adapted to extend into the slot 9 of the die body 3 and heid therein by the spring 2o.

In the particular form illustrated the handleI is so positioned relative to the shank I5 that it willextend toward the rear'of the die body when `the pin I'I is in the forward position. However, this position maybe' changed to suit conditions but, as illustrated Fig.` 10, when the handle is in the rearward position and theV pin inthe forward position, the die cup I3 is back on the die body 3 and the chasers are open.

' It will be readily seen that, by turning the handle in a direction tangentially of the body through 90 degreesin either direction, the collar I6 will be rotated 90 degrees in a direction tangentially of the body. Since the eccentrically located pin: II is rotatably secured in the circumferential slot 9 of the bodyand as the body` is held against' movement, the rotation of the collar IB will cause' the pin II to be rotated through 90 degrees to exert a. lever action on the die cup to move it forward on Ythe body to close or reset the chasers to the cutting position, as illustrated in Fig. 6. i 4 Y Whenjit Visdesired to remove the chasers from theV die head, the voperating means I4 is raised against the action of ,the spring 20 sufficiently to permit the pin II to raise out of the slot 9 and by sliding the'cup I3 back', the Vpin will'engage the slot 8 and 'abutagainst the'c'ollar or ring 'I. This permits', the chasersto be removed from the die head for grinding' orany otherpurpose but main-` tainsthe 'remaining parts ofthe die in assembled condition.

should it be; desired tdisass'embie, the entire'- die'h'ea'd;V for cleaning orany other purpose, the

` operating means i4' is raised further against the action of the`spring 20 to permit the pin I'I to clearA the collar VI (Fig. 11)v and the cup may be moved backtothe positionshown in Fig. l.

Thus, it will be Yseen that wehave provided a simple Voperating means for'A a die head which willjenable the operator'to open and close the chasers Y by a simpl'eone-fourth turn or the operiv ating.handle'andijpermits the chasers to be reset at' the` beginning of the threading operation and opened at the conclusionfthereof in a very accurate" manner.l Likewise, `this Operating means 'enables the Yoperator to openY the die at anytime Vduring the threading operation shouldY mantle the die head'when desired, both of which operations are under the'l'eontrolof the ,operat-` ing handle; Y

to the other, and means for eiecting said shifting and comprising a rotatable member carried by ,the cap and having means engaging the body for effecting said shifting upon rotation of said rctatable member, and means located above said rotatable member for rotating it, said rotatable member. and its rotating means rotatable on a v'common axis.

2. A threadingdie comprising a chaser-carrying b ody,a closing cap, one shitable relative to the other, and means for effecting said shifting and comprising a rotatable member carried by thecapand having eccentrically located means engaging the body for effectingv said shifting upon rotation of said rotatable member, and means located above said rotatable member for rotating it, said rotatable Vmember and its rotating means rotatable on a common axis.

3V. A threading die comprising a Chaser-carrying body, a closing cap shiftable on said body,

, meansrfor shifting the cap relative to said body and comprising a rotatable arm Vcarried by the cap and having eccentrically located means engaging the body for shifting said'cap upon rotationv of said arm, said eccentrically located means comprising a ,pin projecting into aV4 peripheral slot in the body and resilient means for maintaining the pin in said slot, and yieldable to permit release of said pin from the slot to permit further shifting to dismantle said die.

4. A threading Adie comprising a Chaser 'carrying body, a. closing cap, one Vshiftable relative-to the other, means operable in a rotary direction f oneffecting said shifting to open and close the chasersand operable in .a radial direction to permit ',furthershifting. thereby to remove the chasers, and yieldable meansfor normally preventing said radial movement. I

' 5. A threading die comprising a chasercarrying body, a `closing cap,Y one shiftable relativeA A to the other, an operatingmeans rotatable. to eiect a limited shifting thereof to open and close the chasers, and spring-pressed means forv maintainingV said means inA operable position @and yieldable to permit movementin a radialdirection to leffect Van increased limited ,shiftingto permit removal of the chasers.

6." A threading Adie comprising a ing body, a closing cap, one shiftable relative to the other, an operating means rotatable to Aeffect a limited shifting to open and close the chasers, yieldable means for maintaining said means in operable position and to permit movement inta radial direction to eiiect an increased shifting to permit removal of the chasers, and 'means for limiting said last..movement, said4 yieldable means also yieldable Vbeyond, said limiting means for permitting unlimited shifting todismantlev the die.

. '7. A threading Vdie comprising 'a'chaser-carry-'l means for shifting one of Vsaid parts relative to chaser-carrythe other, said means shiftable in a plurality of opposite directions for opening and closing the chasers and shiftable in a radial direction to permit removal of the chasers and for dismantling the die, and yieldable means for normally preventing radial shifting of said shiftable means.

8. A threading die comprising a Chaser carrying body, a closing cap, one shiftable relative to the other, means for effecting said shifting and comprising rotatable means carried by the cap and having means engaging the body for eiecting said shifting, said rotatable means yieldably connected With the cap for transverse movement relative thereto, thereby to permit additional shifting movement of the body and cap, one relatively to the other to permit removal of the chasers.

9. A threading die comprising a Chaser carrying body, a closing cap, one shiftable relative to the other, means for effecting said shifting and comprising rotatable means carried by the cap and having means engaging the body for effecting said shifting, said rotatable means yieldably connected with the cap for transverse movement relative thereto, and a plurality of means carried by the body and cooperating with said body engaging means "whereby on partially releasing the pressure on said body engaging means, the chasers may be removed and on further releasing the pressure, dismantling of the die may be effected.

10. A threading tool comprising a chaser carrying body, a closing cap, one shiftable relative to the other, shiftable means carried by the cap and having a yielding eccentric connection With the body for shifting said body and cap relative to each other, said body having a, plurality of means cooperating with a part of said yielding eccentric connection whereby, on partially releasing the pressure on said eccentric connection, the chasers may be removed and on further releasing the pressure, the dismantling of the tool may be effected.

^ DAVID R. POWELL.

WILLIAM L. MOORE. 

